# Relationship history for MSHA mine 1001920

Current hierarchy: **Philip M  Tait → Tait Aggregate & Company → Tait Aggregate**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Tait Aggregate & Company → Tait Aggregate; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Philip M  Tait → Tait Aggregate; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip M  Tait → Tait Aggregate & Company; 1996-07-01 to current/open; source msha-controller-operator-history